JPS5815180A - Calendar mechanism of electronic timepiece - Google Patents

Abstract

PURPOSE:To obtain the calendar mechanism of an indicator type electron clock which has reduced the number of parts, by constituting a date dial or a day dial of a permanent magnet. CONSTITUTION:A calendar driving coil 3 is energized by an output pulse from a calendar driving circuit once a day, and a calendar display plate 5 consisting of a quenching thin band of a rare earth magnet is fed by 1 step. Also, in case of correcting the calendar, when a calendr quick feed switch is turned on, its signal is received by a calender driving circuit, the calendar driving coil 3 is energized, a quick feed correction of the calendar display plate is executed.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in the calendar mechanism of a pointer type electronic timepiece.

The calendar mechanisms of conventional Koshi clocks with pointers were as follows.

One is to send the calendar by transmitting the rotation of the time display motor to the date plate or day plate via a wheel train. However, this mechanism had the disadvantage that a miscellaneous wheel train mechanism was tested and the number of parts was large. Furthermore, because a relatively large load is applied to the regulating member to position the date plate or day plate and prevent the calendar from jumping due to shocks, etc., the time display motor has a large output torque. However, the disadvantage is that it is difficult to reduce the power consumption of the motor.

Another mechanism is to provide a motor exclusively for feeding the calendar separately from the motor for displaying the time. However, like the previous mechanism, this mechanism also has the drawbacks of a large number of parts and a complicated structure, and also has the drawbacks of high cost.

Therefore, the present invention focuses on the above-mentioned problems and provides a calendar mechanism for a pointer-type electronic timepiece that has a reduced number of parts and a simplified configuration by configuring the date plate or day plate with a permanent magnet. 1. Hereinafter, embodiments of the present invention will be described in detail based on the drawings.

FIG. 1 is a sectional view showing a portion of the calendar of the movement. (1) and (2) are stators made of soft magnetic material, which transmit the magnetic flux excited by the calendar drive coil (3). (4) is a coil core, and (5) is a calendar display board for displaying the date or day of the week made of a quenched ribbon of rare earth magnet, which is rotated by the magnetic flux generated by the calendar drive coil (3).

(6) is a watch base plate into which a wheel train (not shown) is incorporated.

Next, the mechanism for rotating the calendar display board is shown in Figure 2.

(la), (2a) are the stator poles, and (5a) are the poles of the calendar display board. Therefore, if we consider the calendar display board (5) as a rotor, the operating principle is the same as that of an ordinary multi-pole motor, and when current is passed through the calendar drive coil, magnetic flux is generated in the stator, which causes the rotor to rotate. The display board is rotated.

. FIG. 3 is a block diagram showing a drive system for the calendar mechanism.

Normally, it is enough to send the calendar display once a day, so for example, if you have a pointer-type watch that moves in 1-second steps, the pulses every second are counted by a counter (not shown). However, if it is input to the calendar drive circuit (7) once a day, the calendar drive coil (3) is excited by the output pulse from the calendar drive circuit (7), and the calendar display board is advanced one step. In addition, in the case of calendar correction, when the calendar fast-forward switch (8) is turned on, the calendar drive circuit (7) receives the signal, energizes the calendar drive coil (3), and fast-forwards the calendar display board. Let's do it.

At this time, the polarity of the final pulse that drove the calendar display board is stored in a calendar polar storage circuit (9), so as to prevent errors in feeding the calendar display board.

The positioning method for the calendar display board is usually done using a magnetized calendar display board (5
) and the stators (1) and (2). However, in the unlikely event that an impact or the like hits the calendar display board (5),
) and the calendar display board (5) is about to fly off,
The induced voltage generated in the calendar drive coil (3) is detected by the induced @voltage detection circuit (lO), and the lock pulse generation circuit (11) generates a pulse with the same polarity as the induced voltage, thereby applying magnetic force to the calendar display board. 1. As described above, according to the present invention, since no calendar load is applied to the time display motor, the time display is 50 to 60% lower than the conventional one.
The front wheel train mechanism can be simplified. In addition, the simple configuration allows fast-forward correction of the calendar.
It is also possible to prevent the calendar display board from flying off.

As described above, by using the calendar mechanism of the present invention, it has become possible to have a simple structure, strong impact resistance, and to reduce the current consumption of the watch as a whole.

Furthermore, by using a quenched ribbon of rare earth magnet as the permanent magnet material for the calendar display board of the present invention, it is possible to obtain a thin but strong permanent magnet, and it is also possible to increase the effectiveness of this mechanism. .

Furthermore, the quenched ribbon of rare earth magnet has a thickness of o, oam ~
Since the thickness can be reduced to about 0.05 ff, the moment of inertia of the calendar display board can also be reduced, and the effect that the calendar is less likely to fly off due to impact or the like can be obtained.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing a portion of the calendar of the movement of the present invention. FIG. 2 is a diagram showing the operating principle of the present invention. FIG. 3 is a block diagram showing the drive system of the calendar mechanism of the present invention. (1), (2)... Stator (lB),
(2a)...Stator pole (3)...Calendar drive coil (4)...Coil core (
5)...Calendar display board (5a)...Pole of calendar display board (6)...Clock base plate (7)...
... Calendar drive circuit (8) ... Calendar fast-forward switch (9) ... Calendar pole memory circuit (10) ... Induced voltage detection circuit (11)
・・・・・・Lock pulse generation circuit%pr

Claims (1)

[Claims] In a calendar mechanism of a pointer-type electronic watch equipped with a calendar display board that displays at least either the date or the day of the week, the calendar display board is composed of a permanent magnet magnetized in the circumferential direction or the plate thickness direction, and A calendar mechanism for an electronic watch, comprising a drive coil and a stator for rotating the calendar display plate.